Gamma Acid (6-Amino-1-naphthol-3-sulfonic acid salt) from Japan
Gamma acid salts are covered under the HTS 2922.21.1000 enumeration for 6-Amino-1-naphthol-3-sulfonic acid and its salts. Critical for naphthol AS dye series used in pigment printing. Salt form enhances formulation stability.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter
Import Tips
• Distinguish J acid vs Gamma acid via melting point (differential >20°C)
• Iron chelate test confirms purity grade for metal complex dyes
• REACH registration status verification for EU-origin material